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    <title>定义嵌套列表</title>
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    <ol>
        <li>图像设计软件
            <ul>
                <li>Photoshop</li>
                <li>FreeHand</li>
                <li>Illustrator</li>
                <li>CoreIDRAW</li>
            </ul>
        </li>
        <li>网页制作软件
            <ul>
                <li>Dreamweaver</li>
                <li>Frontpage</li>
                <li>Golive</li>
            </ul>
        </li>
    </ol>

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